Gunsmithing brake i.d. question

[redrider308]

Question on the internal diameter of my APA Fat Bastard.The rifle is a TRG 42 in .300WM.What`s the most my brake should be opened? why? and is .356 too much? Thanks,Keith

 

[BK7saum]

Re: brake i.d. question

Not too familiar with brakes, but from what I've read .030" over bullet diameter is pretty common. .020" is usually considered too tight. .356 is going to be about .048" over bullet diameter. Might be bordering on a little oversize, but should still work just fine.

 

[kingjoey]

Re: brake i.d. question

For standard thread-on brakes you'd want to be around .030" over. Anything between a #Q and a #R drill bit will be good.